Half to abeam altmater



(No Model.)

J W HUBBER SMOKE GONSUMING FURNACE.

No. 365,342. Patented June' 21, 1887 Wfinasses;

7 3 the combustion-chamber of the furnace.

UNITED STATES PATENT OFFICE.

JAMES W. HUBBER, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALF TO ABRAM ALTMAYER, OF SAME PLACE.

SMOKE-CONSUMING FUQRNACE.

SPECIFICATION forming part of Letters Patent No. 365,342, dated June 21, 1887.

Application filed August 21, 1885.

To all whom it ntay concern/.-

Be it known that 1', JAMES W. HUBBER, a. citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, havein'vented certain new and useful Improvements in Smoke-Consuming Furnaces, of which the following is a specification.

My present invention relates 'to certain new to .and useful improvements in that class of smokeconsuming furnaces for which Letters Patent of the United States were granted to me on December 16, 1884; and my invention consists in forming a chamber back of the bridge-wall of the furnace, over which a perforated plate is placed. Atmospheric air is led into the chamber, which passes up through the perforated plate and meets the flame from the furnace at the top of the bridge-wall.

It also relates to a cowl or hood of peculiar construction placed in the smoke slack or chimney .of the furnace, and to the other detailsof construction and operation, to be hereinafter fully described.

In the accompanying drawings, forming a part of this specification, Figure l is an elevation of my smoke-consuming furnace, with part of smoke-stack broken away to show the cowlor hood. Fig. 2 is a cross-section through Fig.

3 is a cross-section through the cold-air cl1amber. Fig. 4 represents a section and elevation of hood or cowl.

Similar letters refer to similar parts through- 3 5 out the several views. In place of the air or smoke passages at the end of the exhaust -.pipe, which enters the smoke-stack, as set forth-and described in my Letters Patent of December 16, 1884:, I employ 0 a cowl or hood, A, provided with slotted passages or openings A, and around the hood or cowl is placed a casing or register, B, having like openings, as shown at A, and thiscasing is arranged so as to be moved to the right or left by means of eye-holes O, to which small chains 0 are connected, passing down in frontof the stack or chimney, to wholly or partially exclude the passage of smoke or exhaust steam from the furnace. Through the cowl or hood a space is left, however, of three or four inches between its greatest diameter and the Serial No.175,01s. (N0 model.)

stack. This hood connects with the exhaustfan D through the medium of the pipe E, and intermediate between the stack and exhaustfan is placed a valve, F, and a damper, G.

the exhaust fan ,chamber and passes down into the furnace beneath the grate-bars and receives all of the products of combustion drawn from the smoke-stack by the suction-fan, as

described in my former Letters Patent of December 16, 1884:. From the pipe H extendsa branch pipe, I, provided with asuitable cock, I, which connects with a suction and forcing fan, J, located upon the wall of the furnace,to be hereinafter more fully described. Back of the bridge-wall of my furnace I construet a cold-air chamber, R, the top of which is open, and over the opening I place a perforated plate, L, which rests upon the walls of the chamber, slightly inclining upward or backward from the front wall to the back or rear wall thereof.

The front edge of the perforated plate is raised a little above the top of the front wall of the chamber, so that a small space, M, is

left between the lower face of the plate and the upper face of thewall, whereby a thin sheet of atmospheric air is forced out of the chamber at its point to meet the opposing flame from the furnace.

To the branch pipe I is connected a vertical pipe, N, provided with a damper or valve, 0,

which enters the cold-air chamber K, passing through the wall thereof. These pipes are so arranged that atmospheric air from the suction and forcing fan can be conducted into the pipe II and supply a greater amount of oxygen to the furnace beneath the grate-bars by opening the valve 1.

Both the suction and forcing fans are driven by steam from the boiler through the medium of a belt-connection passing around pulleys at one side of the casings of the respective-fans.

In operation, the casing around the cowl or hood is opened and the damper in the exhaustpipe closed,so as to give free draft to the smokestack until the fire in the furnace has made sufficient headway, when the casing or register around thehood is operated by the small chains so as to close the openings in the hood, and the damper G is opened and the fans set in motion, which draws the products of combustion from the smoke-stack or chimney into the ex haust-fan D and forces it down into the furnace beneath the grate-bars. At the same time, the damper or cook I being closed, atmospheric air will be drawn into thefan-chamber and forced down into the cold-air chamber through the medium of the vertical pipe 'N and up through the perforationsin the plate L and the small space between the edge of the plate and the top of the wall, the former in jets and the latter in a thin sheet, which meets the incoming or opposing flame, which consumes all the unconsu med products of combustion drawn from the smoke-stack, together with the di rect uneonsumed products of combustion from the fuel in the furnace which have not escaped into the smoke-stack, in so complete and full a manner that nothing but a thin unclouded vapor will be seen issuing from the top of the chimney or smoke-stack of the furnace to which my invention is applied.

\Vhen the thin volume of atmospheric air which is forced from the coldair chamber through the small slot or opening between the plate and bridge-wall of the furnace above described meets the opposing flame from the f uel-chamber or furnace, a sheet of blue flame will constantly be seen above the bridge-wall, thereby consuming all products of combustion capable of being consumed.

Should a greater volume of oxygen be required, the cock or damper l in the cold-air pipe I may be opened and admit atmospheric air to the pipe H to mingle with the smoke taken from the smokestack, which is forced into the chamber beneath the fire-grate of the furnace, as above described. It should here be observed that in order to avoid the shrinking and warping of a metal plate for the cold-air chamber a plate composed of fireproof tiling or bricks may be employed, having suitable holes or openings through them for air-passages.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a smokeconsuming furnace, the exhaust-pipe of the smoke-stack or chimney provided with a hood or cow] with suitable openings, and a casing or register with like openings operated by suitable chain or other connections for regulating the draft in the said stack and conducting the uneonsumed pro ducts of combustion from the furnace into the exhaust-pipe, as described.

2. In a smoke-consuming furnace or engine,

wall and the perforated plate, so that a thin sheet of atmospheric air will be forced out of the cold-air chamber at that point and meet the incoming or opposing sheet or volume of flame from the furnace, as described, for the purpose specified.

4. In a smokeconsuming furnace in which a suction blower or fan is employed to draw the products of combustion from the stack, an inverted funnel-shaped mouth'piecc provided with ports or apertures controlled by valves or gates, said mouthpiece beingloeated in the stack of the furnace and coi'mected with the blower, substantially as herein described.

5. In a smoke-consuming furnace, the inverted-funnel-shapcd mouth -piece A in the stack, provided with ports or apertures eontrollcd by valves or gates, said mouth-piece being connected with a suction blower or fan, substantially as herein described.

6. In a smoke consuming furnace, the inverted-funnel-shaped mouthpiece A in the stack, having ports or apcrtu res controlled by valves or gates, in combination with the pipe E, connecting-elbow, suction-blower I), and pipe II, substantially as herein described.

7. In a smoke consuming furnace in which a suction blower or fan -is employed to draw the products of combustion from the stack, theinverted-funnel-shaped mouth-piece A, located in the stack, and having a diameter at its base but little less than the diameter of the stack, said mouthpiece being connected with the blower, and provided with ports or apertures controlled by valves or gates, substantially as and for the purpose herein described.

S. In a smokeconsuming furnace, the suction-blower D, pipes II and E, and an elbow entering the stack, in combination with the iuverted-funnel-shaped mouth-piece G in the stack and joined to the elbow, said mouthpiece having ports or apertures A, and the valve or gate B, by which the ports are opened or closed, substantially as herein described.

In testimony that I claim the foregoing I have hereunto set my hand and seal.

JAMES \V. HUBBER. 

